QUESTION:I am 17 years old and I have had type 1 diabetes for four years. The last time I got my A1c checked it was 8.1 (it has not been this high in years, it is usually in the 7 range).
I am very worried about complications. I try and maintain my diabetes, but most diabetics know that is not easy. My numbers are usually good; they are in the 100s and 200s usually and occasionally in the 300s and rarely in the 400s.
Can anyone ease my mind at all?
AnswerHi Jessica,
An A1C of
8.1% is above the usual target for most adolescents with type 1 diabetes, but one result does
not mean that complications have suddenly developed. Complication risk is related mainly to how much and how long glucose has been above target over time.
For most children and adolescents with diabetes, an A1C goal of
below 7% is appropriate, although goals should always be individualized with the diabetes care team.
Quick perspective: An A1C of 8.1% tells us that your average glucose has been running higher than ideal recently. It is a signal to review your diabetes plan, not proof that you already have complications.
Why Complication Risk Depends on the Long TermResearch in type 1 diabetes shows that keeping glucose closer to target over the years lowers the risk of eye, kidney, nerve and cardiovascular complications.
This means your long-term pattern matters more than one A1C result. If your A1C is usually in the 7% range and has recently risen to 8.1%, the important next step is to understand what changed and correct the pattern early.
You can also compare A1C with your day-to-day readings using our
blood sugar levels chart and
Diabetes Answers and Tools.
What About Readings in the 300s or 400s?Occasional high readings can happen in type 1 diabetes, especially with illness, missed or insufficient insulin, infusion-set problems, food estimation errors, stress or hormonal changes.
However, glucose in the
300-400 mg/dL range should not simply be ignored or treated as a normal part of adolescence.
Important: With prolonged or marked hyperglycemia, especially during illness or if you have nausea, vomiting, abdominal pain, rapid breathing or feel very unwell, check ketones according to your diabetes sick-day plan and contact your diabetes team or seek urgent care when advised.
The ADA recommends postponing intense exercise when glucose is
350 mg/dL or higher if significant ketones are present or insulin deficiency is suspected. :chatgpt-content-reference{index="1"}
Do Not Try to “Burn Off” Very High GlucoseI would not recommend running for an hour simply to lower a glucose reading in the 300s or 400s. Exercise can sometimes lower glucose, but when insulin is insufficient and ketones are present, strenuous exercise can make the situation worse.
Follow your written correction and ketone plan instead.
Food Does Matter, but You Do Not Need to Fear CarbohydratesYou do not need to eliminate chocolate, sweets or carbohydrate completely. The more useful approach is to match carbohydrate intake with your insulin plan, use accurate carb counting when possible, and look for foods or meal patterns that repeatedly cause large glucose rises.
If you use a CGM, look at your
time in range, overnight patterns, post-meal rises and repeated highs rather than judging yourself by isolated numbers.
What You Should Review With Your Diabetes TeamIt would be useful to review:
• basal insulin or pump settings;
• insulin-to-carbohydrate ratios;
• correction factors;
• meal timing and carb counting;
• infusion-set or pump problems, if applicable;
• overnight highs;
• exercise-related patterns;
• illness or stress;
• CGM time in range and time above range.
Do not make major insulin changes on your own unless they are part of your written diabetes plan.
Should You Be Worried About Complications Right Now?You should take the higher A1C seriously, but you should not assume that complications are already present because of one A1C of 8.1%. The important thing is to improve the pattern from here and keep up with recommended screening.
Your diabetes team can tell you when you should be screened for eye, kidney, blood pressure and other complications based on your age, puberty status and how long you have had type 1 diabetes.
My Advice to YouJessica, I would focus less on being frightened by the number 8.1 and more on using it as useful information. Your diabetes control has been better before, which means you and your care team already know that improvement is possible.
Bring your CGM or glucose records to your next diabetes visit and look specifically for repeated times when your glucose rises into the 200s, 300s or higher. That pattern can help your team make safer, more targeted adjustments.
All the best,
Dr. Albana Greca, MD, MMedScFamily Physician, IDF Fellow